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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d6343fba2b704eb147edd7e2ab51651c3bc52d4856c5db28f3997b996db59ca' 
  AND token = 'wHIL1SR/OC9zj69MiblwhYBzYGaieBZy1V2a/Zebdl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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