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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00ceff3cad8970a9b529c1febcdedc4d2a273920af2d492503a702a3cbbbee8c' 
  AND token = 'hKw5thOwYk1dQAgs2ySwBxewvK52IN0U0+muJyx2Bps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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