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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c1636e8bd2b747753e1df757ebf2ada56749a9d694d5f8b8bbcb2f90687e890' 
  AND token = 'Y6dnPeVdeGsdLwmsm68Q30hF9B3V3oMz1QIjKeC4/Ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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