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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eace6b8ea19ee4888d154d319c1890d8e7a453a1a3980178ced665a318283e0c' 
  AND token = '7oGmJUSWYZrs0XZMUMPmp+IACt+Vk3Yv+/QPdbJ9MOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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