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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed691bfe3104739534f06fc68689b967e434916a077a666cc6d0351b26b60223' 
  AND token = '2bDqjyXmZq+CD+v3jG5Go0EODLAfvrhjWdIgzRst4Cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00099

JSON explain

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