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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e450bfd64bd91d1bb534ab5660c08b6739c87ee3343b7d2886b1efe36fa90f5' 
  AND token = '3MFb04SeIonN3HOZxcbL/0kShMb7s1Z94cXstU3tq04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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