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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23070ef0dafac5f05e835d1b15ae01be7137927ba36525d2dfe9347c51537b9c' 
  AND token = 'DFVr8llu40rrrKJ0w8THwlcvtf1mkvMjMI4/aqhvqOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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