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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4958d9d811b136ea051aeb28515a0415a98a1be3a90a2582eeafa30fdb8f9ec' 
  AND token = 'BdXevassz6O0EIFs9o05wpGFR3m6EyiKaJZ1xdi+vwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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