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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a435e76361a07febceb6dc884d9bd23cd22343fc6cac64312eeccde8f0052601' 
  AND token = 'I+NMtnXrjF31sMI5pIqee9E5mtSrk7OPD6Yte9HPX78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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