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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a0002eef23786b818a5ce4c164ed531b1fc9d2da82cf5e87a17835bef5181e1' 
  AND token = '2k4L9dvIxMS9+m6U/zAumUXlNmtQKoodh1MEogRZ5gY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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