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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '040ca419c89b50fb8296b710847eb29c1f36233f0a34188e42d5ec6d4aa366a7' 
  AND token = 'gT+CkzR9+cjnqttfKt3ACoJb+wIo3jnl01LPWP/rLhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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