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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9de901c2f11b66792b7865f1b155f42a45a64852e4e18af323451cd2bc3efdbc' 
  AND token = 'c31xCcbecZxO8f0juH5EqP9yIxXNO/dCKjP1x0r7iSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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