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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd97ad5254d65d026ec00c99688e0b479b7f2b9bfcaed58807bb3373e8df2769b' 
  AND token = 'v4yv7tYxqJR1rPkItcQ0WsL1KWP0BPkSLkIj5ACloME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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