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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f1b367aaaff45da60fb585eed38de473e3b06ae83c7fc7ae94d27987e136e8e' 
  AND token = '59FSH5ViYbvm7LxcAOVSNjxRoyxDorJ7WztSdfcdZD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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