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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9f7a2ece29d9e3a6e48744f11be423808cb1e3cacd1ef18c2eb4547c4adb0f0' 
  AND token = 'xVAuH33J1O5mLK5BnUGU0YH7/6cDbIMcCjpE8+JJd9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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