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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a14c4c116e30c87610454c51a4fb4d08faf1f4623f75e0aba64631e3a863fc50' 
  AND token = 'm+2F7U9XmEBMl4ZunBA1iRSQqMEkxzKvIG9WTyms6eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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