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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beda999c1dc35f8548e9b1b63ba43fddb400aa73c14a6402ead64fbbec5e502f' 
  AND token = 'cqsw1dSf/i2F87k8zeFS/xwqxB62x+nNl56Al9N48iI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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