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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e09e53b83439e0c6b08b45ad0cbb713965d0b787c1067a378ec5719bc4aa5bdf' 
  AND token = 'dOOop0XV89bWseKkoiJohNvXTJhu5K0H1R08QGu0bN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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