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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9add0c5da98bcf4aa141cf55b8025237c2b16a35783b131f9dd52efa7035748d' 
  AND token = '0a1GXS8/tOKfE/f5Mu8d0zeYboDMsty2BXeULTO86Oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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