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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5c0af8b3af04d0412050b2cb3d35f5b4ad0a32a2ff8e38ae411d11dc7dda3e2' 
  AND token = '6T0PG7G/rLdIlRWDuh7iraR9LgFPvNEG7tvf/EJu7WA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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