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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6ddd2b8e2adb91be6d1753a078f25696f8127e2805596184c407539709b89d9' 
  AND token = 'GGmS9xek27JAvJDpAp76ooC4HLHKqg/dyS0POtYc4ZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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