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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e74cbbca5031db973f60b776b814a4bda54a5088e6b119a2fee6f759dc73163' 
  AND token = 'AJu6/Tzu0XmI8ZHy5MwZKhNxVdv46w1C7uwUauodWlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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