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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68c0ca15337d15897bdfd2e71c4b4785a488081a1c6bcf4b31ae503bbe668e3b' 
  AND token = 'bHep3kjM6OFYcML84jOe8ruDSAz5LQsn7zrK8HNRJmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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