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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f70409ec622e49a58930fd7305661a71546f5646811e76bc8b9557217c9e0331' 
  AND token = '7QdDx8gK2zaZLaf08tppyY1ErpgJDDrsSCF04V5gTro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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