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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e9ff742ebb3da69a0f9cc931fe347c65d297a0c4ed3b7e176f4302abe66d37d' 
  AND token = 'RzI1YGUeutTWh0kDbY8yjWvYjZR7O9lxxKMjK4IXixM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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