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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c56d1d7a9158a0265a646d78d71306e25d30b47c0e0cf08ed7d4247e1e78d015' 
  AND token = 'HvZUzGOM34li2R852fXiVM0oZbmXTs48sxGWW/9SksA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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