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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a02c077c65f7fcf32199450616521539381894b8e2c21425df69df8c3474de24' 
  AND token = 'kXBFzjA6Ixa62vvLwUpq7Fywj2l19+KcyWpv33arHfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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