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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c0911f64c21a63d24577ecbe018c91373437e3c86f51889b98ba3acee083435' 
  AND token = 'mV7GcOOueGBl/K3Me7LBEIuogAXFTEsKtjQ4uP8uq0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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