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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f88dd602e9020cb4c4b37a43a88124c2eb241ab68abe4d21143935e3e4932690' 
  AND token = 'XLQyxu4Y9G3k6iscdcPbx+3369p1yUqJjrEYy2A/Yz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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