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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0d3dd31466ae4572f2da9bebab03594131be900109458039336a61fbe5bbc2f' 
  AND token = '3HyBFqENbEngalayZrXh+33fRgQ3kmOvgmRlhSJ/PTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}