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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54e25539c8aac7c504efd6de504cb5d7f1ef15360b9d2cefb981c7193eb2710e' 
  AND token = '0eyJrun36cxONYqwuITjmZUME2YnD58oeHA+MK+UjwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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