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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '005e60fbe1157cea2091e0f531b0c76b38d862f16af1012b3d0ebe268c940a8a' 
  AND token = 'TNb88Ig2BhurWXwi9RVUqCLnIZo/mG2XFaZJleCtf4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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