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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ddd66b175cc4c8b09dfa0a1dcd49fd04745414a24dcb59d646ac3f2102b5770' 
  AND token = '0XFs8FkarS9Q+o07xjRt0Ew3kIggKSpngUFSNJY9jzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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