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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '904b600b3ad00f019bf87ae44fdb377ce008f0b0090228928d9bfd96ca66c24a' 
  AND token = 'EqavEoB63lwXyXdqavbgBA81I1KmMekMe5Y6wdKXK5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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