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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f5650a5efa185bf0b8d49576996622ff2e86ea13ea02fbb1658a63adf624baa' 
  AND token = 'ZVDdGPco31PejdsQDFL/VBGDSaDKfmRSC8VbXY6hGNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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