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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffe2f0298812004355085d0fc704384d6b986591b31934c252ff96e4ff4e6177' 
  AND token = 'BmbGSr6J5Myb5hzhw8l1iUo5PwWyV83l8I1dFbaJTyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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