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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de1a8d39c615e4442644bced97a2c82316bee5d6f837e88cf772d1a71197e748' 
  AND token = '72gIYSoXFUInjU0dQNYcviEl5JG7HibF2GvX86HGgPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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