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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cf5455e0ba275eafa6b4553ee532bd08a60015b267d4e4d805e325b1624fd57' 
  AND token = '88CvZtlUbG1Wh7SDbnQLNTeRr54Jc8OOLdToBD04lJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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