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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13a6bbb7f2f0f49fc73d2f161f72918601fb270fa054a86b7999fe8a44e24bc3' 
  AND token = 'tNsHa2YS9eukIwzblZRZNYmTZkUV1mr0rFkk9FKnVMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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