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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dcc6b270421d54eba48b05e331c667caf38d40bf779c47b260a65317340a2d9' 
  AND token = 'UGoBkxhFdtfgkKlz2aRaaYkbAmVqKqOk8i5GmH/gexA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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