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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b282c418e4f9f208b2716c89edf645c0c298e6017b50d2ba66dd5318549c535' 
  AND token = 'Yx6a4hgugzLCptbOEs4X3w8QLaww0ai0a9cBUaMNYnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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