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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a5fc606108528da13bf8c362962902f5b03ba72e0655b81fcd3429af15517cc' 
  AND token = 'hrDq9sLd0KXM6xXmuj1nzdfP/avN17tKlruyqqs5YPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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