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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2219af2da786ca54879f6b0cace314bd6029a98da7b85586d5b4848cb1cda7c4' 
  AND token = 'ja7b1lANs6pFGOL0kgdSzT3Ftyx0O4Yotdumohq7HEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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