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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28873a383513aa77d0b29356aa1ea6548bcf9b15fc2c7f51d91beecedc6632bf' 
  AND token = 'eWA9id9YpUwPj65q53t0+ag+raFe+HxJ4DioRLYlmpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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