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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6ad016e5b8971121ba622b74521e352565eae018527f0b80865c7321c457cca' 
  AND token = 'zEv7OO466T1YcRnlC4Y3SvJbFXChorTUPgWOcJPWP1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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