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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e3300cd28e1339503b782de7beb70b23e9f566746f34d484ce5f2e060679811' 
  AND token = 'wfGOlZR4PQCk0zm6JMDVYHF7UrMFuOuc2WLdu2oBZLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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