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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fbb5b25eb9612092695dbdc51be197456585ed2056b29b69a61278f681ccbdf' 
  AND token = 'YcxQPyZd5XjW9jez8Idrq4zytYg9rhL6tBAE33gFk4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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