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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96237d97d67eaeda27e4416f9bdcef521a6281cded3a26f71c52ee71175c4cec' 
  AND token = 'UBwrIk30y+V4/SlUE002Fpt+YZ/Gx6LpXIghnfmbXfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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