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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a733865692a4b13b00e7e6ce92f7c7bdd6bd0fd413c85f77f9cb790d0c8fed7' 
  AND token = '2R8ay/gMIWcDetPLL1dNGPiy9nduRAWqvrKZGcgSZSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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