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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5634f4cab3e4a90f6310b1bddce59fa1ddcf00d0e3b2a3379abfb6567bed3ed0' 
  AND token = 'VgX4s3xjAbszC9Rnjx/dNz/Ygh3JHhqrI9I2ILQV0rQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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