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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08c9c0c2908523f82b829ff9c6ccd985b3b057932c1d7241348361488c69879d' 
  AND token = '9HUJMlKYlEjR7wtMGAljIWHwCFtxeQMmTl3TyFW73k0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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