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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '999e7de24543bf2b013cad0c44dc5d2ac8609e9fdece830ae6fcc45dd60ee12a' 
  AND token = 'BRCI1aI/ifIVDH88vTtKbCl+lzh2Yc5P4WBNJCsiuS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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