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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b05878186bb8c97a402aacfe764ecc0a7ff1f3b6af87d7dcb7c61de7d849158' 
  AND token = 'cOFRoWQgjEdMT1mUf1tosBwnrIgRo1x3CSnqkM0lhy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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