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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d6977649bbbcb7a827a4886355311dfdd43dece1831c61355ced5a0f7a05678' 
  AND token = '0ZT7AjB6/RNPMS7hQxlnNQWfjj0YeJ7wrPkwTWgzIlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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