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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64a8885ea6e3cd88e3a220bcafbdd123c41e706eb039155ae6c5f6d5622bfead' 
  AND token = 'PZOgzFoUV9fz0naHci45Hsh0If9hIE47X5AC6vJ7pxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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