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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '576f151dd3b5a8a7482f0e064e78186c8cd5611291128be4c02cc24f3cb60bd5' 
  AND token = 'UD+wfupKET8/lcfap7ZIiSaEuqUwUeE7egKooNHcYjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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