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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42f84ac5edba3b35fe4665a10701e8c96c6b790b9d8a99f653d45f266d6de6e8' 
  AND token = 'bGuKbkFu0F68iPXkFqrIqA1dIqnh3Kkjrkam4D3wT4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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